Stiffening of printing presses



M. ROCKSTROH.

STIFFENING 0F PRINTINQ PRESSES. APPLICATION FILED Aums, 1921.

Patented NOVJZS, 19220 Original application. filed October 12,

Patented Nov. 28, 1922.

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To all whom it may comer n: I

Be it. known that 1, MAX Roonsrnol-r,

citizen of the German Republic, residing at Klein-Sedlitz, near Pirna, Saxony, Germany, have invented. certain new and useful Improvements in Stiffening of Print ing Presses (for which I have filed applications inGermany, March 6, 1918; Austria, March 20, 1918; Hungary, March 18, 1918; Switzerland, March 21, 1918; Denmark, March 22, 1918; Italy, April 10, 1918; Great Britain, April 6, 1918; France, May 22, 1918), of which the following is a specification.

This invention is a division of my pending application Serial No. 416,585 filed Oct. 12, 1920 and has for its object to provide means for the correction of a defect which all printing presses exhibit after continued use, that under great strains the side frames bow out sideways at the cylinder bearings and become elastic. Even when the side frames are gripped by the base to the highest permissible limit a springing out is not entirely to be avoided.

Another object of the invention is the provision of specific means for removing this defect which is attained by connecting the side frames together in the locality of thebearings of the pressure cylinder by a tierod secured to the side frames and passing through the hollow axle or sleeve of the pressure cylinder.

With these objects in view the invention consists in the novel construction and arrangement of parts as will be hereinafter described and claimed.

In the drawing the figure represents a front elevation of a printing press with parts broken away showing in cross sec tion the details of my invention.

Referring in detail to the several elements of the device, the base member a of the printing press is provided with side members Z) and 0 respectively secured in upright relation thereto and having near their upper ends bearing apertures j for the reception of the hollow sleeve or axle Z by which the pressure cylinder 6 of the printing press is rotatably supported. The pressure cylinder 6 is adapted to co-act with the printing frame 70 which is mounted to reciprocate on roller bearings p mounted on the bed plate 9 of the printing press. The ends of the pressurecylinder e are provided 192:), Serial No. 416,58 Divided and this application filed August 15, 1921. $eria1 No. 492,;1841.

with gearing r by which said pressure cylinder is rotated through suitable power instrumentalities not shown. The axle Z is apertured axially throughout its length for the reception of a tie-rod m which is freely insertable therethrough.;and projects at either end beyond the side frames 6 and c.

The tie-rod m is threaded at both ends and passes through abutment plates 0 which are made larger than the bearing apertures j so so to lie against the outer surface of the side frames, being held in engagement therewith by nuts 1?. screwed on the threaded ends of the tie-rod. The axle Z is preferably made of smaller diameter where it engages the bearing apertures on the side frames than that of the adjoining portion of said axle forming with said portion of larger diameter annular shoulders s which abut against the inner surface respectively on the side frame. Said annular shoulders co-operating together form a spacing means to prevent inward movement of the side frames and the abutment plates held in engagement with the outer surface of the side plates by the tension of the tierod m afford means to prevent outward movement of said side members.

It will be apparent that by this constructionl have provided a means for rendering rigid against displacement the free ends of the side members and that the tie-rod is relieved of all strains of supporting the pressure cylinder.

ft is obvious that the specification details of construction and configuration of parts described herein may be modified in various ways without sacrificing the advantages of the invention or departing from the scope thereof as defined in the appended claims.

Having described my invention what I claim as new and desire to secure by Letters Patent, is:

1. In a printing press comprising a base and pressure cylinder, side members secured in upright position to said base, said side members being provided with aligned bearing apertures, a hollow rotatable axle mounted in said apertures, said pressure cylinder being secured to said axle and a tie-rod floatably mounted within the axle and secured to said side members.

2. In a printing press, a base, side members secured thereto having aligned bearing apertures, a pressure cylinder having an axial cylindrical sleeve projecting at both ends therefronnsmd sleeve beingformed with external bearing surfaces cooperating 'ith the bearing apertures in said side mem hers, and a tie-rodfl'oatably'niountedjwithiri' said sleve and secured to said side members.

3. In a printing press, a-base', side mem bers secured thereto having aligned bearing apertures" therein a pressure oyl'i'nderhaving an axial sleeve projecting at both endsthere from, said sleeve being formed with an end portion of reducedgdiameter forming an ex ternal bearing surface cooperating with the bearing apertures in the sidemembers, said portion of reduced diameter \fOrI'fiing With the part ofla'rger diameter; annular shoulders cooperating with the' inner surface 01 hers secured thereto having aligned bearing aperturestherein, a pressure cylinder having an axial sleeve extending therethrough projecting at both ends therefrom, said sleeve being formed with external hearing surfaces cooperating with the bearing apertures in the side m'emhers, a tie-rod fioatably mounted Within said sleeve and projecting. from either end through said side members, abutment plates mounted on the ends of said tie-rod in engagement With the outer surfaces of said side members and means cooperating with-:the ends-of said tie-rod to hold sai d abutment plates in position.

In testimony whereof I'have hereunto set my hand in presence of tivo subscribing. Witnesses.

MAX ROCKSTROH. WVitnesses C. SOHLIM CEECH, M. IIANSDING. 

